[Jessarah]

This site in Tennessee was once believed to be built by Welsh immigrants of a very early date. More recent scholarship suggests American Indians built it. Lovely place for a hike!

Where can I read more about that? I didn't see anything on it from the link.

[Tax-chick]

Here's a link. The key figure is one Prince Madoc.

http://www.welshdragon.net/resources/myths/madoc_usa.shtml